To use these men's nylon briefs, simply put them on like you would any regular underwear. Make sure the U - convex pouch is in the right position for maximum comfort. When it comes to sizing, always double - check the size chart as different suppliers may have variations. This will help you find the perfect fit. For maintenance, since they are made of nylon, you can easily toss them in the washing machine. Use a gentle cycle and mild detergent to keep the material in good condition. Avoid using bleach as it may damage the fabric. After washing, let them air - dry for best results. This way, your briefs will last a long time and continue to provide you with the comfort and protection you need.